Popsugar Celebrity The Royals Prince William and Kate Middleton Relationship Timeline Prince William and Kate Middleton's Royal Road to Baby #3 February 14, 2018 by Allie Merriam View On One Page Photo 6 of 35 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 6 March 2008: Joining the Royal Fold With their romance back on, William and Kate become increasingly serious in their relationship. She joins him for a family ski vacation in Switzerland that Spring. Previous Next Start Slideshow Princess CharlotteThe RoyalsKate MiddletonPrince WilliamPrince GeorgeCelebrity KidsThe British Royals